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| Introduction |
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| A statement is an assertion or a sentence that is either true or false, but not both. |
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| A variable is a symbol that may represent any member of a specified set called replacement set or domain of that variable. |
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| A mathematical expression is a symbolic representation for a member. |
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| An equation is a sentence that asserts that two mathematical expressions are equal. |
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 called an inequation or an inequality. An inequation may contain one variable or more than one variable. |
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| Examples: |
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| a) 8 + 7 = 15 is a true statement. |
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| b) 9 + 12 = 18 is a false statement. |
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| c) x2 + 4x - 7 is a mathematical expression. |
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| d) ax+b<0 is an inequation. |
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